Granted Patent
Utility
US 4,258,747 · App. 06/026,175
Flow system with pressure level interlock control apparatus
Inventor:
Arnold G. Trobaugh
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Apr 2, 1979
Inventor
Arnold G. Trobaugh
Assignee (at issue)
Johnson Controls, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.